<template>
  <div id="app">
    <router-view class="router-view" v-slot="{ Component }">
      <transition :name="state.name">
        <component :is="Component" />
      </transition>
    </router-view>
  </div>
</template>

<script setup lang="ts">
import { reactive, toRefs } from 'vue'
import { useRouter } from 'vue-router'

interface Transition {
  name: string
}

const router = useRouter()
const state = reactive<Transition>({
  name: 'slide-left'
})
router.beforeEach((to, from) => {
  if (to.meta.index > from.meta.index) {
    state.name = 'slide-left' // 向左滑动
  } else if (to.meta.index < from.meta.index) {
    // 由次级到主级
    state.name = 'slide-right'
  } else {
    state.name = '' // 同级无过渡效果
  }
})
</script>

<style lang="less">
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}
#app {
  height: 100%;
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  // text-align: center;
  color: #2c3e50;
}
.router-view {
  width: 100%;
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: 0 auto;
  -webkit-overflow-scrolling: touch;
}
.slide-right-enter-active,
.slide-right-leave-active,
.slide-left-enter-active,
.slide-left-leave-active {
  height: 100%;
  will-change: transform;
  transition: all 500ms;
  position: absolute;
  backface-visibility: hidden;
}
.slide-right-enter {
  opacity: 0;
  transform: translate3d(-100%, 0, 0);
}
.slide-right-leave-active {
  opacity: 0;
  transform: translate3d(100%, 0, 0);
}
.slide-left-enter {
  opacity: 0;
  transform: translate3d(100%, 0, 0);
}
.slide-left-leave-active {
  opacity: 0;
  transform: translate3d(-100%, 0, 0);
}
.van-badge--fixed {
  z-index: 1000;
}
</style>
